| 摘要 |
In a rangefinder apparatus, a clamping circuit receives a far-side signal I2 output from a first signal processing circuit and outputs a signal I2c having a greater value than a clamp signal Ic and the far-side signal I2. An arithmetic circuit receives a near-side signal I1 output from a second signal processing circuit and the signal I2c output from the clamping circuit, calculates an output ratio (I1/(I1+I2c)), and outputs an output ratio signal. An integrating circuit receives the output ratio signal and, together with an integrating capacitor, integrates the output ratio signal several times. When switching the level of the clamp signal Ic before subsequent distance measuring operations in a continuous distance measurement, a clamp level switching circuit adds a value to the clamp signal, setting a new level.
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